Change detection of getifaddrs to use AST_C_COMPILE_CHECK, backported from trunk (as suggested by kpfleming)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@101894 65c4cc65-6c06-0410-ace0-fbb531ad65f3

acinclude.m4

@@ -97,6 +97,33 @@ if test "${USE_$1}" != "no"; then
 fi
 ])
 
+# AST_C_COMPILE_CHECK can be used for testing for various items in header files
+
+# AST_C_COMPILE_CHECK([package], [expression], [header file], [version])
+AC_DEFUN([AST_C_COMPILE_CHECK],
+[
+    if test "x${PBX_$1}" != "x1" -a "${USE_$1}" != "no"; then
+	AC_MSG_CHECKING([if "$2" compiles using $3])
+	saved_cppflags="${CPPFLAGS}"
+	if test "x${$1_DIR}" != "x"; then
+	    $1_INCLUDE="-I${$1_DIR}/include"
+	fi
+	CPPFLAGS="${CPPFLAGS} ${$1_INCLUDE}"
+
+	AC_COMPILE_IFELSE(
+	    [ AC_LANG_PROGRAM( [#include <$3>],
+			       [ $2; ]
+			       )],
+	    [   AC_MSG_RESULT(yes)
+		PBX_$1=1
+		AC_DEFINE([HAVE_$1], 1, [Define if your system has the $1 headers.])
+		AC_DEFINE([HAVE_$1_VERSION], $4, [Define $1 headers version])
+	    ],
+	    [       AC_MSG_RESULT(no) ] 
+	)
+	CPPFLAGS="${saved_cppflags}"
+    fi
+])
 
 AC_DEFUN(
 [AST_CHECK_GNU_MAKE], [AC_CACHE_CHECK(for GNU make, GNU_MAKE,